Hello and thank you for using Just Answer,As you would have to split the income it may not benefit you at all. You would have to show half of his and he would be rewuired to report half of yours. If you did not make any estaimated paymenst for 2011, I cannot see where this would benefit you. You would also both need to itemize or use the standard deduction. Yu can always run the numbers to see but I cannot see where filing separately would benefit you based on the informationyou supplied.I wish I could advise other wise.